General Mahmud Ahmad

From 9/11 Encyclopedia:

Lt. Mahmud Ahmad was former head of the Pakistan Secret Service Isi, until he "resigned" on October 6th, 2001. 

Only a few hours later the war against the Taliban started. According to a October 12th, 2001-story in the Times of India," the Pakistani intelligence service, ISI, Washington's close ally in the 'infinite war' against terror, was intimately involved with the 9-11 hijackers. 
This might have been the real reason, why Ahmad quit his job:
"The US authorities sought his removal after confirming the fact that $100,000 were wired to WTC hijacker Mohammad Atta from Pakistan 
by Ahmad Umar Sheikh (->) at the instance of Gen Mahmud." 
timesofindia.com/articleshow.asp?art_id=1454238160 (NOTE: Ahmad Umar Sheikh is also known as Sheikh Saeed) 
General Mahmud Ahmad was obviously deep involved in the planning of a war against the Taliban since 1997/1998 and even worked together with the Northern Alliance: During a May 2001 visit to Dusseldorf, Germany, the "...Northern Alliance led by ousted Afghan president Burhanuddin Rabbani and his military commander Ahmed Shah Masood have mustered Western support". Source: indiareacts.com/archivefeatures/nat2.asp?recno=10&ctg=%20

Only 8 weeks later, (due to the indictment against "hijacker 20", Habib Zacarias Moussaoui), "on or about August 1 and 3, 2001, Ramzi Bin al-Shibh, using the name "Ahad Sabet," wired approximately $14,000 in money orders to Moussaoui (->)in Oklahoma from train stations in Dusseldorf and Hamburg, Germany." (Point 67, Source: http://findlaw.com

) . On September 5th, 2001 Binalshib traveled from Dusseldorf,to Madrid, Spain, and did not return to Germany. (Point 89)

From parts of an original article by GROUND ZERO Forum at Scoop (->): The ISI once founded the Taliban with help of the CIA. This is no secret, even US Military cheerleader Janes Defense Weekly (->) confirms that "half of Taliban manpower and equipment originate(d) in Pakistan under the ISI". It is therefore a big mystery, that the ISI, with all their insider information, was the only secret service that didn't warn about an attack on America in the lead up to 9/11.
(-> early warnings) 

Even more disturbing, is that the visit of General Mahmood in Washington between September 4th and 15th, 2001 is so resolutely ignored in the history books in Washington. It has emerged, that even questions about this visit have been altered in official White House transcripts. In the course of Condoleezza Rice's (->) May 16, 2002 press conference (which took place barely a few hours after the publication of the "Bush Knew" headlines in The New York Post), an accredited Indian journalist asked a question on the role of General Mahmoud Ahmad: (...)

Q: Dr. Rice? 
Ms RICE: Yes? 
Q: Are you aware of the reports at the time that the ISI chief was in Washington on September 11th, and on September 10th $100,000 was wired from Pakistan to these groups here in this area? And why was he here? Was he meeting with you or anybody in the Administration?
Ms RICE: I have not seen that report, and he was certainly not meeting with me. (...)

Although there is no official confirmation, in all likelihood General Mahmoud Ahmad met Dr. Rice during the course of his official visit. 
The word "ISI Chief" was later erased from the transcript and replaced with "inaudible".
Conclusion: This event didn't "officially" happen in Washington, but there are various reports about it.

Here is one from September 9th, 2001, 2 days before the attack: September 9th, 2001 "..
.ISI Chief Lt Gen Mahmood's week-long presence in Washington has triggered speculation about the agenda of his mysterious meetings at the Pentagon and National Security Council. Officially, State Department sources say he is on a routine visit in return to CIA Director George Tenet's earlier visit to Islamabad. Official sources confirm that he met Tenet this week. 
He also held long parleys with unspecified officials at the White House and the Pentagon. But the most important meeting was with Mark Grossman, US Under Secretary of State for Political Affairs. US sources would not furnish any details beyond saying that the two discussed 'matters of mutual interests.' What those matters could be is a matter of pure conjecture. One can safely guess that the discussions must have centred around Afghanistan, relations with India and China, disarmament of civilian outfits, country's nuclear and missiles programme and, of course, Osama Bin Laden..." karachipage.com/news/Sep_01/today.html 

On the morning of September 11th (Mahmoud) met Senate Joint Intelligence Co-Chairman Bob Graham (->) (D-FL) and his House Intelligence Co-Chairman and former CIA operative Porter Goss (->)(R-FL), who both had prior knowledge about an attack, "with planes", since August 6th 2001, as they both confirmed to the Washington Post. 
He later met, after September 11th, with Senator Joseph Biden, chairman of the powerful Committee on Foreign Relations of the Senate. 
(Before Sep11th, Mahmoud had meetings with UnderSecretary Marc Gossmann.
-More about this meeting at scoop.co.nz/mason/stories/HL0207/S00119.htm )